#include<stdio.h>
int main()
{
	int n,i;
	while(scanf("%d",&n) != EOF)
	
	{
		i = 0;
		while(n != 1) {
			if(n % 2 ==0) 
				n = n/2; 
			
			else 
				n = n*3+1;
			
			i++;
		}
		printf("%d\n",i);
	}
	return 0;
}
